So I just had this happen the other night. When I made the Demogorgan shot, it got hung up. Glad this thread was here. I'm not too afraid to rip things apart, because I completely rebuilt my IJ, but I know what it's like to be afraid the first time with these machines. Here's what I had to take off:
1. Left ramp-4 screws. I didn't have to completely take it out, but enough to lay it on its side.
2. Upper Black Upside Down plastic art-1 small black screw in the back, 1 "wing" nut in the front, and 1 screw down in the cut out area
3. Lower Black Upside Down plastic art- 1 screw on the left and then you have to loosen the nut on the right side (5/16"). The nut is really tough to access and I had to go slow with it. After loosening it slightly, I was able to slide it out.
Put it back together in reverse and take pics if you need to to keep track.